Abstract: PSEs are provided. In one aspect, the PSE includes a first port group, a second port group, a second port group and a power sourcing module. The first port group includes a plurality of PSE ports, wherein the PSE ports in the first port group are connected in parallel and connected with a first line pair and a second line pair in the Ethernet cable. The second port group includes a plurality of PSE ports, wherein the PSE ports in the second port group are connected in parallel and connected with a third line pair and a fourth line pair in the Ethernet cable. The detecting and classifying module performs feature detection for a Power Device (PD) connected with the Ethernet cable. The power sourcing module outputs a working voltage from the first port group and outputs the working voltage from the second port group.